Thread sealant recommendations - Vintage Mustang Forums
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post #1 of 21 (permalink) Old 08-08-2019, 07:06 AM Thread Starter
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Thread sealant recommendations

Need a recommendation for thread sealant for hydraulic brake lines. My calipers use pipe threads on the AN line adapter and I need a sealant that's impervious to brake fluid. TIA, John

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post #2 of 21 (permalink) Old 08-08-2019, 07:36 AM
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Permatex 54540 is made for brake systems

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post #3 of 21 (permalink) Old 08-08-2019, 07:50 AM Thread Starter
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Permatex 54540 is made for brake systems
Is there a difference between 54540 and Permatex 59235? Amazon carries both sealants

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post #4 of 21 (permalink) Old 08-08-2019, 09:32 AM
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Quote:
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Is there a difference between 54540 and Permatex 59235? Amazon carries both sealants
My smart azz answer is 4,695...

From Permatex's site it appears the 59235 is more general, but does say it is okay for automotive brakes.
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post #5 of 21 (permalink) Old 08-09-2019, 08:03 AM
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You don't need sealant for any of our brake line fittings... I would strongly advise against it. If it gets into the system it can cause a blockage.

What are you trying to seal?
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post #6 of 21 (permalink) Old 08-09-2019, 08:29 AM Thread Starter
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You don't need sealant for any of our brake line fittings... I would strongly advise against it. If it gets into the system it can cause a blockage.

What are you trying to seal?
The AN to NPT thread adapters that screw into the calipers.

John

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post #7 of 21 (permalink) Old 08-09-2019, 08:40 AM
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The AN to NPT thread adapters that screw into the calipers.
Don't need it, just tighten the fitting into the caliper.
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post #8 of 21 (permalink) Old 08-09-2019, 08:48 AM
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If you need sealant, something is wrong, Sean is right no sealant on brakes...

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post #9 of 21 (permalink) Old 08-09-2019, 09:07 AM Thread Starter
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Don't need it, just tighten the fitting into the caliper.
OK, will do. I guess I was channeling my old days as a plumber's apprentice where they put sealant on all npt joints.

John

The Fauxstang. Dynacorn 67 fastback. Dart SHP 363, Close ratio Magnum 6 speed, 3.70 Eaton Truetrac in a fabricated full floater 9", SorT coil over suspension. Still in pieces.
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post #10 of 21 (permalink) Old 08-10-2019, 10:18 AM
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OK, will do. I guess I was channeling my old days as a plumber's apprentice where they put sealant on all npt joints.
I always add some sort of sealant, from decades of working in Industry. Never had a problem so far, just keep the tape/dope away from the first 2 threads. I've noticed some brake fittings come with a red sealant of some sort pre-applied. No harm installing them dry, if it leaks you can always go back and address it.

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post #11 of 21 (permalink) Old 08-10-2019, 10:32 AM
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I always add some sort of sealant, from decades of working in Industry. Never had a problem so far, just keep the tape/dope away from the first 2 threads. I've noticed some brake fittings come with a red sealant of some sort pre-applied. No harm installing them dry, if it leaks you can always go back and address it.



NO SEALANT! Period! End of story! Nada! If you want to give advice, try giving good advice.
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post #12 of 21 (permalink) Old 08-10-2019, 10:41 AM
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NO SEALANT! Period! End of story! Nada! If you want to give advice, try giving good advice.
Just giving my personal experience, and if you'll note, my final comment was to try installing them dry. If sealant was NEVER required, suppliers would not ship fittings with it already applied. It can also avoid over-tightening a fitting that's dripping, which can strip out or crack fittings. I'm glad you're so superior, but I have Decades of experience in Industrial pneumatics and hydraulics.

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post #13 of 21 (permalink) Old 08-10-2019, 01:29 PM
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I've seen that red stuff on threads of various new lines. I've yet to see a consensus of whether it is a sealer, threadlock, or combination of both. I don't know either but I can definitely say manufacturers definitely put something on brake line threads quite often. I don't recall ever using or needing sealer on brake lines but I often use sealer or teflon tape on other types of hydraulic line threads. Since brake systems are basically just hydraulics with a different type of fluid (not oil) I don't have a problem with the judicious use of sealer.
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post #14 of 21 (permalink) Old 08-10-2019, 03:56 PM
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I think that red stuff is made to be a threadlocker but it seems to double as a sealer.......
I use it for both. Itís kinda rubbery/plastic feeling. Not sure what the OEís use but this is what I use

https://www.vibra-tite.com/threadloc...-3-threadmate/

Yes I know a pipe thread should need nothing, but the fit of that stuff these days is less than ideal. I put Wilwood brakes on the front of my Mustang and used that so the caliper fitting was pointed where I wanted it without having to really crank it tight and risk cracking the caliper housing, maybe there was a better solution but that worked for me without any issue. Hasnít moved or leaked.

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post #15 of 21 (permalink) Old 08-10-2019, 07:56 PM
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Need a recommendation for thread sealant for hydraulic brake lines. My calipers use pipe threads on the AN line adapter and I need a sealant that's impervious to brake fluid. TIA, John
Ask the manufacturer of the caliper.

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